Have you tried green coffee (nescafe) it's the first coffee i've had that doesn't have that awful kick in the after taste - it's not caffeine free, but they claim green coffee aids weightloss as well as other health benefits
http://www.nescafe.co.uk/product_details_en_com.axcms?Id=73
http://www.dailymail.co.uk/health/article-1214658/Need-lose-weight-Then-try-green-coffee.html
http://www.nescafe.co.uk/product_details_en_com.axcms?Id=73
http://www.dailymail.co.uk/health/article-1214658/Need-lose-weight-Then-try-green-coffee.html